Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $)	Jan. 31, 2012	Apr. 30, 2011
Preferred stock, par value (in Dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Common stock, par value (in Dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	12,367,417	12,276,658
Common stock, shares outstanding	9,585,024	10,496,628
Treasury stock, shares	2,782,393	1,780,030